Ubuntu Security Notice USN-2815-1
19th November, 2015
libpng vulnerabilities
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 15.10
- Ubuntu 15.04
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
Summary
libpng could be made to crash or run programs as your login if it
opened a specially crafted file.
Software description
- libpng
– PNG (Portable Network Graphics) file library
Details
Mikulas Patocka discovered that libpng incorrectly handled certain large
fields. If a user or automated system using libpng were tricked into
opening a specially crafted image, an attacker could exploit this to cause
libpng to crash, leading to a denial of service. This issue only affected
Ubuntu 12.04 LTS. (CVE-2012-3425)
Qixue Xiao discovered that libpng incorrectly handled certain time values.
If a user or automated system using libpng were tricked into opening a
specially crafted image, an attacker could exploit this to cause libpng to
crash, leading to a denial of service. (CVE-2015-7981)
It was discovered that libpng incorrectly handled certain small bit-depth
values. If a user or automated system using libpng were tricked into
opening a specially crafted image, an attacker could exploit this to cause
a denial of service or execute code with the privileges of the user
invoking the program. (CVE-2015-8126)
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 15.10:
-
libpng12-0
1.2.51-0ubuntu3.15.10.1
- Ubuntu 15.04:
-
libpng12-0
1.2.51-0ubuntu3.15.04.1
- Ubuntu 14.04 LTS:
-
libpng12-0
1.2.50-1ubuntu2.14.04.1
- Ubuntu 12.04 LTS:
-
libpng12-0
1.2.46-3ubuntu4.1
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart your session to make
all the necessary changes.